I unmounted the device and performed fsck on it, which detected a nice bunch of problems:
Free blocks count wrong for group #5641 (32265, counted=11). Fix<y>? yes Free blocks count wrong for group #5642 (32311, counted=57). Fix<y>? yes Free blocks count wrong for group #5643 (33697, counted=1449). Fix<y>? yes Free blocks count wrong for group #5644 (34162, counted=1908). Fix<y>? yes Free blocks count wrong for group #5645 (36278, counted=4024). Fix<y>? no Free blocks count wrong for group #5646 (33303, counted=1049). Fix<y>? no Free blocks count wrong for group #5647 (32276, counted=22). Fix<y>? *etc* After completing fsck and remounting the device, df has started displaying correct size again. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/717313 Title: df reports negative disk usage -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
